Parallel string packer



H. L. BIGELOW PARALLEL STRING PACKER Oct. 15, 1963 2 Sheets-Sheet l 1; 3.

IN V EN TOR.

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United States Patent 3,106,961 PARALLEL STRING PACKER Herbert L. Bigelow, Whittier, Calii, assignor to Baker Oil Tools, 1nc., Los Angeles, Calif., a corporation of California Filed Feb. 24, 1959, Ser. No. 794,928 15 Claims. (Cl. 166-134) The present invention relates to subsurface well bore equipment, and more particularly to well packers or anchors adapted to be set in well casings or similar conduit strings disposed in well bores.

This application is a continuation-in-part of my application for Subsurface Well Bore Anchor, Serial No. 734,633, filed May 12, 1958, now Patent No. 2,966,216.

A plurality of parallel tubular strings are mounted in a well bore in association with one or more well packers to conduct fluids through separate paths between the top of the well bore and diiferent depths therein. Such separate paths pass through the well packer, which has normally retracted elements, such as a packing structure or slips, or both, for outward expansion into engagement with the wall of the surrounding well casing. The well packers heretofore available have had serious restrictions in the size or diameters of the separate paths or bores through them, in the size of the normally retracted elements that could be used, and in the range of expansion of the normally retracted elements into engagement with the well casing.

Accordingly, it is an object of the present invention to provide a subsurface well packer, and the like, having a plurality of separate generally parallel flow paths therethrough, which can be made of comparatively large diameter.

Another object of the invention is to provide a subsurface well packer, and the like, having a plurality of separate, generally parallel flow paths therethrough and a normally retracted packing structure having a greater quantity of packing material therein per unit of length, so that a larger amount of packing material is available for expansion and sealing against the wall of the surrounding well casing.

A further object of the invention is to provide a well packer, and the like, having a plurality of separate, generally parallel flow paths therethrough, which is of strong and sturdy construction, relatively economical to manufacture, and comparatively easy to set in a well bore.

This invention possesses many other advantages, and has other objects which may be made more clearly apparent from a consideration of a form in which it may be embodied. This form is shown in the drawings accompanying and forming part of the present specification. It will now be described in detail, for the purpose of illustrating the general principles of the invention; but it is to be understood that such detailed description is not to be taken in a limiting sense, since the scope of the invention is best defined by the appended claims.

Referring to the drawings:

FIGURE 1 is a combined side elevational view and longitudinal section through an apparatus embodying the invention and disposed in a well casing;

FIG. 2 is an enlarged longitudinal section through the well tool, with certain of its parts in their initial, retracted positions;

FIG. 3 is an enlarged fragmentary longitudinal section through the slip and expander portion of the apparatus disclosed in FIG. 2;

FIG. 4 is a cross-section taken along the line 44 on FIG. 2;

FIG. 5 is a view similar to FIG. 2, with the normally retracted parts of the apparatus expanded against the well casing;

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FIG. 6 is a cross-section, an enlarged scale, taken along the line 66 on FIG.

FIG. 7 is a cross-section, along the line 77 on FIG. 5;

FIG. 8 is a cross-section, on along the line 88 on FIG. 5.

The well tool disclosed in the drawings, to exemplify the invention, is a well packer A adapted to be anchored in packed-off condition in a well casing B against movement in both longitudinal directions. The well packer has a plurality of passages 10, 11 therethrough and can be set in the well casing by a mechanism C associated with the well packer and passing through one of such passages. Following setting of the packer, this mechanism is withdrawn.

The packer includes an upper body member 12 having the aforementioned pair of longitudinal, generally parallel passages 10, 11 extending therethrough. One of such passages 19 extends through a depending tubular member 13, which actually constitutes part of the upper body member, having an upper threaded pin 14 threadedly secured within a companion bore or box 15 in the latter. The upper body member 12 also includes a second tubular part or member 16 depending from its main portion and having a threaded pin 17 threadedly received within a box 18 in the latter. The second tubular member also has a passage 11 therethrough forming a portion of the second passage through the upper body member 12.

The depending first and second tubular members 13, 16 of the upper body member are slidable within passages 19, 2% extending through a lower body member 21. The

an enlarged scale, taken an enlarged scale, taken second tubular member 16 is piloted within a counterbore 22 of the second longitudinal passage 20, extending through the lower body member and opening through its lower end. The first tubular member 13 is piloted within the first passage 19 in the lower body member 21, the first tubular member being initially secured to the lower body member by a frangible device in the form of a split shear ring 23 received within an upper counterbore 24 in the lower body member 21 and having a smaller or narrower portion 25 disposed within an external groove 26 in the first tubular member 13. A tubular extension 27 is threadedly secured within the lower portion of the lower body member 21, forming a continuation of its first passage 19. The lower portion of the extension 27 has an inwardly directed flange 28 adapted to coact with a lower disc portion 29 of the mechanism C for setting the well packer in the well casing, as described hereinbelow. i

The well packer A is adapted to be anchored to the well casing B against upward movement therewithin by a plurality of circumferentially spaced upper slip segments 30 having upwardly facing external wickers or teeth 31 adapted to engage the wall of the well casing. These segments initially engage the lower end of the body member 12 and are held in retracted position by shear screws 32 threadedly attaching them to an upper expander 33 slidable along the tubular members 13, 16, this upper expander having longitudinal parallel bores 34, 35 extending therethrough for receiving the tubular members. This upper expander 33 has an expander surface 36 converging in an upward direction and coacting with companion tapered internal surfaces 37 on the upper slip segments 3%.

The upper expander 33 is initially retained in a particular position with respect to the upper body member 12, in which the upper slip segments 30 are retracted, by a releasable shear device. As disclosed, such shear device includes a longitudinal holding pin 38 threadedly received within the upper end of the upper expander 33 and piloted within a longitudinal companion bore 39 in the upper body member 12. A transverse shear pin 40 extends through a lateral hole 41 in the upper body member 12 between the tubular members 13, 16 and through a companion transverse hole in the holding pin 38, thereby releasably attaching the upper expander to the upper body member. Since the tubular members 13, 16 are threadedly attached to this upper body member 12, the upper expander 33 is releasably held initially in a particular posia lower expander 45 having a pair of longitudinal bores 46, 47 extending therethrough that slidably receive the tubular members 13, 16. This lower expander has a downwardly converging expander surface 4 -3 coacting with companion inner surfaces 49 on a set of lower segmental slips St surrounding the expander 45, these lower slips being held initially in retracted position against the lower expander by shear screws '51 securing them to the lower expander. The lower slips rest upon the upper end of the lower body member 21 and have downwardly facing wickers or teeth 52 for anchoring the well packer against downward movement in the well casing.

Initially, the lower expander 45 is releasably held in the position disclosed in FIG. 2, in which the lower slips 5% are retracted, by a shear device that attaches the lower expander to the lower body member. As shown, a longitudinal lower holding pin 53 is threaded-1y attached to the lower expander and is piloted withina companion longitudinal bore 54 in the lower body member 21, a transverse shear pin 55 extending through a lateral bore 56 in the lower body member 21 and through a companion hole or bore in the holding pin 53, in order to releasably attach the lower expander to the lower body member.

The expansion of the upper and lower segmental slips 7 30, against the well casing B is effected by shifting the upper body member 12 and the first and second tubular portions 13, =16 thereof downwardly'with respect to the lower body member -21. This is actually a relative movement, since the lower body member 21 may be shifted upwardly with respect to the upper body member 12 and along the depending first and second tubes 13, 16. Such relative movement can occur through use of any suitable device. As shown, a sleeve 6% extends downwardly within the first passage 10 of the upper body member 12, and engages a shoulder 61 therein. A tension mandrel 62 extends downwardly through this sleeve and through the first passage and first tubular member 13, the lower portion of this tension mandrel being suitably secured to a release stud 63 having a small diameter or weakened por tion 64 at which the stud can pull apart when subjected to a predetermined tensile force. This release stud is attached to a lower rod 65 secured to the disc 29 that engages the inwardly directed flange 28. A downward force is imposed on the sleeve 6% and an upward pull taken on the tension mandrel 62, release stud 63, rod I 7 power or piston portion (not shown) of the apparatus is connected to the sleeve 6 and the cylinder portion (not shown) of the apparatus is connected to the tension man- 'The force created in the setting equipment disclosed in the aforementioned patent will urge the sleeve 69 downwardly and exert an upward pull on the tension mandrel 62. Such downward force is, thus, imposed on the upper body member 12 and the upward force is imposed through the tension mandrel d2, release stud 63, rod 65 and disc 29 upon the lower body member 21. When the force imposed exceeds the strength of the shear pins 40, 55 releasably holding the upper expander 33 to the upper body member 12 and the lower expander 45 to the lower body member 21, as well as the strength of the screws 32, 51 attaching the upper slip segments 30* to the upper expander and the lower slip segments 50 to the lower expander 45, and the shear strength of the narrow portion 25 of the shear ring 23 disposed within the groove 26 of the first tube 13,.all of the shear members are disrupted and the upper body member '12 and lower body member 21 shifted toward each other. The lower body member 21, in effect, slides relatively upwardly along the first and second tubular members 13, 16. Such relative sliding action effects a decrease in the longitudinal distance between the upper and lower body members, re-

sulting in a shifting of the upper expander 33 relatively up along the tube 13, 16 and behind the upper slip segments 39, to expand the latter outwardly against the well casing B, and also a shifting of the lower slips 50 upwardly along the lower expander 45 and radially outward against the well casing. The upper expander 33 is also relatively shifted toward the lower expander 45 to foreshorten the packing structure 42 and effect its expansion into engagement with the wall of the well casing (FIG. 5).

The downward force imposed upon the upper body member 12, and the upward force imposed upon the lower body member 21 will continue, to insure the tendency to bring such members closer together, thus firmly wedging the upper expander 33 behind the upper slip segments 39 and the lower expander 45 behind the lower slip segments Sit, as well as further foreshortening the packing member 42 and insuring its firm sealing against the wall of the well casing, as Well as against the peripheries of the first and second tubes or tubular members 13, 16. The wickers 51, 52 on the upper slip segr apparatus in both directions within the Well casing.

The setting force imposed upon the parm will continue to be exerted and to increase until the upward pull on the tension mandrel 62. exceeds the strength of the release stud 63 as its weakened or reduced diameter portion 64, this stud then pulling apart and permitting the setting apparatus *C, including the sleeve 69 and the mandrel 62, to be withdrawn upwardly through the well oasing B to the top of the hole, as set forth in the aforementioned Patent No. 2,687,775. The disc 29 and rod 65 can drop downwardly from the packer, so as to leave an unimpeded first passage ll? through the packer.

Assurance is had that the removal of the downward force on the upper body member 12 and the upward force on the lower body member 2-1 will not allow the parts :to return to their initial retracted positions by pro- 7 viding a one-way ratchet or look device acting between the lower body member 21 and the first tube 13 ot' the upper body member or structure. As disclosed, the first tube .13 has circumferential ratchet teeth 7 t thereon facing in an upward direction which are adapted to engage companion downwardly facing ratchet teeth 71 on a ratchet ring or sleeve '72 disposed in a groove 73 defined between the upper end of the lower body extension 27 and a downwardly facing shoulder 74 on the body member 21. The outer surfaces of the split ratchet ring or sleeve are formed as tapered cam teeth or faces 75 engaging companion 'mternal cam teeth or faces 76 in the lower body member. It is evident that the first tubular member 13 can move downwardly relative to the lower engaged. Upward movement of the lower body member 21 along the first tubular member 13 is permitted since the inner teeth 71 on the ratchet ring 72 will merely ratchet or slide over the external ratchet teeth 79 on the inner tubular member. However, any tendency for the lower body member 21 to move downwardly be prevented by the coengagement between the ratchet teeth 70, 71 and the camming action of the cam teeth or faces 75, 76 tending to urge and hold the ratchet teeth inwardly to maintain them in engagement with one another.

After the well packer has been set in the well casing, a tubing string (not shown) of the proper diameter can be lowered in the casing. The diameter of this tubing string is greater than the diameter through the second passage 11 of the upper body member or head 12 so that such member will feed into the upper portion of the first passage 16 in the head. Accordingly, fluid flowing upwardly through the first passage 1% in the apparatus will continue passing upwardly through such tubing string (not shown) to the top of the hole. A second tubing string (not shown) can then be lowered through the well casing and will be guided by the upper tapered guide surface 89 on the upper body member head 12 into the second passage 11. Accordingly, fluid moving upwardly through the second passage 11 of the apparatus will continue to flow through the second tubing string to the top of the hole, following a path that is separate and distinct from the path pursued by the fluid flowing through the first passage and the first tubing string.

By virtue of the packer construction described and illustrated, one of the passages ill, such as the first passage, can be made of a comparatively large internal diameter. In effect, the tubular members l3, 16 can be secured to the upper body member 12 and be disposed comparatively 4 closely to the Wall of the well casing B when the apparatus is disposed therewithhi. The upper and lower expanders 33, 45, as well as the intervening packing 42, may be relatively thin at this point, but these parts achieve considerable thickness in crosssectional area in the region of the apparatus removed from such minimum distance between the tubular members 13, 16 and the cylindrical peripheries of the upper and lower expanders 33, 45 and pliant, elastic or rubber packing 42. In fact, the slips 3t 5%) need not even be located opposite this thin portion of the upper expander. As illustrated most clearly in FIGS. 4 and 7, the segmental slips can be disposed arcuately in a position away from this region of minimum distmce between the periphery of the tubular members and the peripheries of the expander and the packing. The slips can have ample thickness so as to permit their engagement with die expanders and posses a relatively large range of outward expansion, enabling the well packer to be used in casings of different internal diameters. Even with a comparatively large range of expansion, the upper and lower slips 3%), it) will remain in contact with the ends or" the upper and lower body members 12, 21, respectively, as well as still retaining substantial tapered surface contact with the upper and lower expanders 33, 45.

The upper and lower expanders have a substantial cross-sectional area, due to the fact they are solid memhere that have the bores 34, 35, 4s, 47 therethrough, to enable the tubular members 13, 16 to slidably pass through such members. Similarly, the rubber or rubber-like packing member 42 is a solid member, with bores 43, 44 therethrough, enabling the first and second tubes 13, 16 to pass through them. However, there is a considerable volume of rubber or rubberlike material in this packing, such that the relative shifting of the expanders 33, 45 toward one another in setting the apparatus, and in foreshortening the packing sleeve, will expand the rubber into firm sealing engagement with the wall of the well casing B without an exorbitant movement of the expander members toward one another. In fact, only a relatively small extent of movement is ample to shift the packing sleeve 42 into firm existence of the relatively large volume of rubber or rubher-like packing material also insures that the well packer can be used in well casings in which a relatively large expansion of the packing is necessary to effect a seal against the wall or" the well casing. That is to say, the apparatus can be set in well casings in which the packer has a substantial initial clearance with the inner wall of the latter.

Not only can the first tubular member 13 have a large diameter, but, if desired, both of the tubular members 13, in can have comparatively large diameters, as well as the companion passages 16, 11 that communicate therewith. Thus, the second passage 11 through the upper head 12 can have a larger diameter, as well as the passages through the second tube 16 and the second passage in the lower body member 21. For convenience of illustration, the holding pins 33, 53 have been disclosed as being between the first and second tubes 13, 16, and, in tact, lying on a common diameter with the axes of these tubes. However, such holding pins can be displaced considerably from the position illustrated in the cross-sectional views, such as FIG. 4. They can be placed close to the tapered surface of each expander 33, 45. The removal of the holding pin 53 in an upward direction, as seen in FIG. 4, will obviously provide much more space for the first and second tubes 13, 16. Thus, the second tube 16 can then have a much greater diameter, its axis being shifted closer to the axis of the first tubular member 13. in fact, both of the tubular'members, and the respective first and second passages l0, 11, can have equal and relatively large diameters, if desired, there still being suflicient arcuate space around the expanders 33, 45, and between the positions of closest proximity of the tubes 13, 1 to the cylindrical surfaces of the expanders and packing 42 to permit the use of sizeable slips 30, 56 of ample arcuate extent, to insure their firm gripping engagement with the Wall of the well casing over a comparatively large area, in order to distribute the anchoring force around large sections of the casing wall, thereby insuring against buckling of the casing under mgh pressure conditions. With tubes 13, 16 of such large diameter, the flow paths through the packers are also of correspondingly large diameter, permitting, if need be, other equipment, such as perforating apparatus and pumping equipment, to be moved through the well packer A and its tubular members l3, 16 after the tubing strings (not shown) have been inserted in the first and second passages it), 11.

The inventor claims:

1. In a well tool adapted to be disposed in a well here: upper and lower body members spaced longitudinally from one another, each member having longitudinal passages aligned with longitudinal passages in the other member; tubes secured to one of said members in communciation with the passages in said one member and slidable in the passages in said other member; normally retracted means on said tubes disposed between and engageable with said members and adapted to be expanded outwardly upon relative movement of said body members toward each other; and one-way lock means acting between one of said tubes and said other member to prevent said body members from moving away from each other after outward expansion or" said normally retracted means. 7

2. In a well tool adapted to be disposed in a well bore: upper and lower body members spaced longitudinally from one another, each member having longitudinal passages aligned with longitudinal passages in the other member; tubes secured to one of said members in communication with the passages in said one member and slidable in the passages in said other member; an upper expander slidable on said tubes; normally retracted upper slips engaging said upper expander and upper body memher; a lower expander slidable on said tubes; normally retracted lower slips engaging said lower expander and lower body member; normally retracted packing means on said tubes between said expanders; said body members being adapted to be moved relatively toward each other to expand said upper and lower slips and packing means outwardly.

3. In a well tool adapted to be disposed in a well bore: upper and lower body members spaced longitudinally from one another, each member having longitudinal passages aligned with longitudinal passages in the other mernber; tubes secured to one of said members in communication with the passages in said one member and slidable in the passages in said other member; an upper expander slidable on said tubes; normally retracted upper slips engaging said upper expander and upper body member; a lower expander slidable on said tubes; normally retracted lower slips engaging said lower expander and'lower body member; normally retracted packing means on said tubes between said expanders; said body members being adapted to be moved relatively toward each other to expand said upper and lower slips and packing means outwardly; and one-way lock means acting between one of said tubes and said other member to prevent said body members from moving away from each other after outward expansion of said upper and lower slips and packing means.

4. In a well tool adapted to be disposed in a well bore: upper and lower body members spaced longitudinally from one another, each member having longitudinal passages aligned with longitudinal passages in the other member; tubes secured to one of said members in communication with the passages in said one member and slidable in the passages in said other member; and normally retracted means on said tubes disposed between and engageable with said members and adapted to be expanded outwardly upon relative movement of said body members toward each other; said normally retracted means including a lower expander on said tubes; initially retracted lower slip means engaging said lower expander and lower body member; said body members being adapted to be moved relatively toward each other to expand said slip means outwardly.

5. In a well tool adapted to be disposed in a well bore: upper and lower body members spaced longitudinally from one another, each member having longitudinal passages aligned with longitudinal passages in the other memer; tubes secured to one of said members in communication with the passages in said one member and slidable in the passages in said other member; and normally re tracted means on said tubes disposed between and engageable with said members and adapted to be expanded outwardly upon relative movement of said body members toward each other; said normally retracted means including a pliant, elastic packing having passages aligned with the passages in said body members and through which said tubes pass; -a lower expander on said tubes; initially retracted lower slip means engaging said lower expander and lower body member; said body members being adapted to be moved relatively toward each other to expand said packing and slip means outwardly.

6. In a well tool adapted to be disposed in a well bore: upper and lower body members spaced longitudinally from one another, each member having longitudinal passages aligned with longitudinal passages in the other member; tubes secured to one of said members in communication with the passages in said one member and slidable in the passages in said other member; an upper expander slidable on said tubes; normally retracted upper slips engaging said upper expander and upper body member; a lower expander slidable on said tubes; normally retracted lower slips engaging said lower expander and lower body member; normally retracted packing means on said tubes between said expanders; said body members being adapted to be moved relatively toward each other to expand said upper and lower slips and packing means outwardly; said upper expander, packing means, and lower expander having passages aligned with the passages in said body members and through which said tubes pass.

7. In a well tool adapted to be disposed in a well bore: upper and lower body members spaced longitudinally from one another, each member having longitudinal passages aligned with longitudinal passages in the other member; tubes secured to one of said members in communication with the passages in said one member and slidable in the passages in said other member; and normally retracted means on said tubes disposed between and engageable with said members and adapted to be expanded outwardly upon relative movement of said body members toward each other;'said passages in said upper body member opening through its upper end and adapted to receive individual parallel tubing strings extending to the top of the well bore; the upper ends of said tubes terminating substantially below the upper end of said upper body member to allow entry of the individual parallel tubing strings into said passages.

8. In a well tool adapted to be disposed in a well bore: upper and lower body members spaced longitudinally from one another, each member having longitudinal passages aligned with longitudinal passages in the other member; tubes secured to one of said members in communication with the passages in said one member and slidable in the passages in said other member; an upper expander slidable on said tubes; normally retracted upper slips engaging said upper expander and upper body member; a lower expander slidable on said tubes; normally retracted lower slips engaging said lower expander and lower body member; normally retracted packing means on said tubes between said expanders; said body members being adapted to be moved relatively toward each other to expand said upper and lower slips and packing means outwardly; said passages in said body member opening through its upper end and adapted to receive individual parallel tubing strings extending to the top of the well bore.

9. In a well tool adapted to be disposed in a well bore:

upper and lower body members spaced longitudinally from one another, each member having longitudinal passages aligned with longitudinal passages in the other member; tubes secured to one of said members in communication with the passages in said one member and slidable in the passages in said other member; and normally retracted means on said tubes disposed between and engageable with said members and adapted to be expanded outwardly upon relative movement of said body members toward each other; said normally retracted means including a lower expander on said tubes; initially retracted lower slip means engaging said lower expander and lower body member; said body members being adapted to be'moved relatively toward each other to expand said slip means outwardly; said passages in said upper body member opening through its upper end and adapted to receive individual parallel tubing strings extending to the top or" the well bore.

10. In a well tool adapted to be disposed in a well bore: upper and lower body members spaced longitudinal- 1y from one another, each member having longitudinal passages aligned with longitudinal passages in the other member; tubes secured to one of said members in communication with the passages in said one member and slidable in the passages in said other member; and normally retracted means on said tubes disposed between and engageable with said members and adapted to be expanded outwardly upon relative movement of said body members toward each other; said normally retracted means including a pliant, elastic packing having passages aligned with the passages in said body members and through which said tubes pass; a lower expander on said tubes; initially retracted lower slip means engaging said lower expander and lower bodymember; said body me'mbers being adapted to be moved relatively toward each other to expand said packing and slip means outwardly; said passages in said upper body member opening through its upper end and adapted to receive individual parallel tubing strings extending to the top of the well bore.

11. In a well tool adapted to be disposed in a well bore: upper and lower body members spaced longitudinally from one another, each member having longitudinal passages aligned with longitudinal passages in the other member; tubes secured to one of said members in communication with the passages in said one member and slidable in the passages in said other member; and upper expander slidable on said tubes; normally retracted upper slips engaging said upper expander and upper body member; a lower expander slidable on said tubes; normally retracted lower slips engaging said lower expander and lower body member; normally retracted packing means on said tubes between said expanders; said body members being adapted to be moved relatively toward each other to expand said upper and lower slips and packing means outwardly; said passages in said upper body member opening through its upper end and adapted to receive individual parallel tubing strings extending to the top of the well bore; said upper expander, packing means, and lower expander having passages aligned with the passages in said body members and through which said tubes pass.

12. In a well tool adapted to be disposed in a well bore: upper and lower body members spaced longitudinally from one another, each member having longitudinal passages aligned with longitudinal passages in the other member; a plurality of parallel tubes communicating with the passages in said members, each tube being secured to one of said members and slidable in a passage in the other of said member; normally retracted means on said tubes disposed between and engageable with said members and adapted to be expanded outwardly upon relative movement of said body members toward each other; and one-way lock means acting between one of said tubes and one of said members to prevent said body members from moving away from each other after outward expansion of said normally retracted means.

13. In a well tool adapted to be disposed in a well bore: upper and lower body members spaced longitudinally from one another, each member having longitudinal passages aligned with longitudinal passages in the other member; a plurality of parallel tubes communicating with the passages in said members, each tube being secured to one of said members and slidable in a passage in the other of said member; and normally retracted means on said tubes disposed between and engageable with said members and adapted to be expanded outwardly upon relative movement of said body members toward each other; said normally retracted means including a lower expander on said tubes; initially retracted lower slip means engaging said lower expander and lower body member; said body members being adapted to be moved relatively toward each other to expand said slip means outwardly.

14. In a well tool adapted to be disposed in a well bore: upper and lower body members spaced longitudinally from one another, each member having longitudinal passages aligned with longitudinal passages in the other member; a plurality of paralell tubes communicating with the passages in said members, each tube being secured to one of said members and slidable in a pasesage in the other of said member; and normally retracted means on said tubes disposed between and engageable with said members and adapted to be expanded outwardly upon relative movement of said body members toward each other; said normally retracted means including a pliant, elastic packing having passages aligned with the passages in said body members and through which said tubes pass; a lower expander on said tubes; initially retracted lower slip means engaging said lower expander and lower body member; said body members being adapted to be moved relatively toward each other to expand said packing and slip means outwardly.

15. In a well tool adapted to be disposed in a well bore: upper and lower body members spaced longitudinally from one another, each member having a pair of longitudinal passages aligned with a pair of longitudinal passages in the other member; a pair of parallel tubes communicating with the passages in said members, each tube being secured to one of said members and slidable in a passage in the other of said member; and normally retracted means on said tubes disposed between and engageable with said members and adapted to be expanded outwardly upon relative movement of said body members toward each other; said normally retracted means including a lower expander on said tubes; initially retracted lower slip means engaging said lower expander and lower body member; said body members being adapted to be moved relatively toward each other to expand said slip means outwardly; said slip means being disposed on diametrically opposite sides of said expander and being displaced circumferentially from a longitudinal plane in which the axes of said tubes lie.

References Cited in the file of this patent UNITED STATES PATENTS Brown et a1. Aug. 30, 1960 

1. IN A WELL TOOL ADAPTED TO BE DISPOSED IN A WELL BORE: UPPER AND LOWER BODY MEMBERS SPACED LONGITUDINALLY FROM ONE ANOTHER, EACH MEMBER HAVING LONGITUDINAL PASSAGES ALIGNED WITH LONGITUDINAL PASSAGES IN THE OTHER MEMBER; TUBES SECURED TO ONE OF SAID MEMBERS IN COMMUNICIATION WITH THE PASSAGES IN SAID ONE MEMBER AND SLIDABLE IN THE PASSAGES IN SAID OTHER MEMBER; NORMALLY RETRACTED MEANS ON SAID TUBES DISPOSED BETWEEN AND ENGAGEABLE WITH SAID MEMBERS AND ADAPTED TO BE EXPANDED OUTWARDLY UPON RELATIVE MOVEMENT OF SAID BODY MEMBERS TOWARD EACH OTHER; AND ONE-WAY LOCK MEANS ACTING BETWEEN ONE OF SAID TUBES AND SAID OTHER MEMBER TO PREVENT SAID BODY MEMBERS FROM MOVING AWAY FROM EACH OTHER AFTER OUTWARD EXPANSION OF SAID NORMALLY RETRACTED MEANS. 